Addendum_No_1.pdf

COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT

Addendum #1

SOLICITATION: (IFB1) FAAA 2016000366

SOLICITATION: 145 Elm Street Soil Remediation Project

ISSUED: June 29, 2016

CDPHE did not receive any questions during the review period.

CDPHE is making the following changes to the IFB.

1. The steel fence surrounding the property may be cut to allow access to the work areas, but must be fully restored, including welding and painting, to the satisfaction of the property owner.

2. The bid schedule has been revised. Bidders shall use the attached revised bid schedule when preparing and submitting their bids.

3. The Soil Remediation Site Plan has been revised. Bidders shall use the attached revised Site Plan when preparing and submitting their bids. Changes include:

a. For area 2.5.1, no work will take place east of the fence line. The area to receive pea gravel has been modified. Refer to the revised Soil Remediation Site Plan.

b. For area 2.5.3, stumps and roots shall be removed by the Contractor to a depth of 12 inches below existing grade. Removed stumps and roots may be disposed of at the California Gulch Superfund Site-Wide Repository.

c. For area 2.5.5 Option B, Contractor shall use red pavers sized approximately 12 inches by 12 inches by 1 inch thick in place of flagstone referenced in the original bid documents. Contractor-provided pavers shall match those provided and/or used by the property owner.

4. CDPHE will perform and pay for all chemical analysis of imported fill materials. Contractor shall provide CDPHE Project Manager one week notice prior to delivery of any fill materials to the job site for the purposes of obtaining samples and performing chemical analysis.

5. All soil and imported backfill materials shall meet the following criteria:

Parameter Allowable Value

Lead less than 10 mg/kg

Arsenic less than 10 mg/kg

Cadmium less than 10 mg/kg pH 6 to 10

6. The following information from the LCCHP Workplan contains additional information on imported materials that is applicable to this project.

Cover and Replacement Fill Requirements

Soils used as replacement fill or cover material will be obtained from local borrow sources and will be tested to verify compliance with the program’s “clean fill” standard. All sources of fill material (i.e., general fill, topsoil, or road base) will be tested to confirm that the concentrations of lead, arsenic and cadmium are below the standards established for the program, as listed on Table 5-1. The fill material will also be submitted for paste pH and gradation analysis for comparison to the requirements listed on Table 5-1. With respect to soil texture or gradation, material used for general fill or topsoil will generally be a sandy silt material with less than 10 percent by weight made up of material sized greater than 2 inches in diameter.

Gravel road-base material used for driveway, walkway or other areas at the request of the property owner/resident shall generally meet the requirements of a Class 6 (3/4-inch maximum) or Class 5 (1.5-inch maximum) aggregate as specified by the Colorado Department of Transportation and will most likely be obtained from a commercially operated gravel pit. Gravel road base or other general fill material obtained from a commercial source will be sampled and tested once prior to use at any residential properties within OU9. Fill materials obtained from borrow areas or other sources within the California Gulch Superfund Site will be sampled and tested once prior to use and periodically thereafter at the minimum frequency of approximately one sample per 1,000 cubic yards of material used. Clean fill material may be stockpiled at a central location and delivered for use at individual properties as the need arises. When sampled, a composite sample will be collected from a stockpile or original source of fill material and analyzed for the parameters listed in Table 5-1.

Composite samples representative of the material in use at the time of sampling will be analyzed for the parameters listed in Table 5-1 in accordance with the SOP for Fill Sampling (Appendix A). Each fill sample will be analyzed for lead at an off-site laboratory by USEPA SW-846 Method 6010B (refer to QAP, Appendix C). In addition to lead, samples will be analyzed for arsenic, cadmium, pH, organic content and particle size retained on the No. 200 sieve (>0.075 mm). Table 5-1 specifies the requirements for fill materials placed on residential properties. If these requirements are not met, the materials will not be used.

End of Addendum